Gitweb: http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=5c2aed...
Commit: 5c2aed622571ac7c3c6ec182d6d3c318e4b45c8b
Parent: 15bba37d62351749c3915add81f673b256952ee1
Author: Jason Baron <jbaron@redhat.com>
AuthorDate: Thu Feb 28 11:33:03 2008 -0500
Committer: Rusty Russell <rusty@rustcorp.com.au>
CommitDate: Mon Jul 28 12:16:28 2008 +1000
stop_machine: add ALL_CPUS option
-allow stop_mahcine_run() to call a function on all cpus. Calling
stop_machine_run() with a 'ALL_CPUS' invokes this new behavior.
stop_machine_run() proceeds as normal until the calling cpu has
invoked 'fn'. Then, we tell all the other cpus to call 'fn'.
Signed-off-by: Jason Baron <jbaron@redhat.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
CC: Adrian Bunk <bunk@stusta.de>
CC: Andi Kleen <andi@firstfloor.org>
CC: Alexey Dobriyan <adobriyan@gmail.com>
CC: Christoph Hellwig <hch@infradead.org>
CC: mingo@elte.hu
CC: akpm@osdl.org
---
include/linux/stop_machine.h | 8 +++++++-
kernel/stop_machine.c | 32 +++++++++++++++++++++++++-------
2 files changed, 32 insertions(+), 8 deletions(-)
diff --git a/include/linux/stop_machine.h b/include/linux/stop_machine.h
index 5bfc553..18af011 100644
--- a/include/linux/stop_machine.h
+++ b/include/linux/stop_machine.h
@@ -8,11 +8,17 @@
#include <asm/system.h>
#if defined(CONFIG_STOP_MACHINE) && defined(CONFIG_SMP)
+
+#define ALL_CPUS ~0U
+
/**
* stop_machine_run: freeze the machine on all CPUs and run this function
* @fn: the function to run
* @data: the data ptr for the @fn()
- * @cpu: the cpu to run @fn() on (or any, if @cpu == NR_CPUS.
+ * @cpu: if @cpu == n, run @fn() on cpu n
+ * if @cpu == NR_CPUS, run @fn() on any cpu
+ * if @cpu == ALL_CPUS, run @fn() first on the calling cpu, and then
+ * ...
